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D( x )
-5*x = 0
-5*x = 0
-5*x = 0
-5*x = 0 // : -5
x = 0
x in (-oo:0) U (0:+oo)
-6/(-5*x)-6 = 9 // - 9
-6/(-5*x)-9-6 = 0
6/5*x^-1 = 15 // : 6/5
x^-1 = 25/2
-1 < 0
1/(x^1) = 25/2 // * x^1
1 = 25/2*x^1 // : 25/2
2/25 = x^1
x = 2/25
x = 2/25
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